Hi. I live in sydney Australia and my car is 2001 year model 2.2L toyota camry.Done 32000kms.Summer in sydney is very hot but not all the time, some days it can be go up to 42c' normally 28-38c' in winter 2-10c' but it can go down to 0c' in some mornings. Can i use 0w-40 grade engine oil as a year round oil? Such as mobil 1 0w-40? owners manual say above 0c' 10w-30, 15w-40 or 20w-50 and below 0c' 5w-30 doesn't say any thing about 0w grade. Toyota Australia recomended 20w-50 year round use.If i use 0w-40 will my engine damage? or shorten the life? Thank you. Prasanna.